28993018 has 16 divisors (see below), whose sum is σ = 45562176. Its totient is φ = 13810720.

The previous prime is 28993001. The next prime is 28993043. The reversal of 28993018 is 81039982.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11805 + ... + 14047.

It is an arithmetic number, because the mean of its divisors is an integer number (2847636).

Almost surely, 2^28993018 is an apocalyptic number.

28993018 is a deficient number, since it is larger than the sum of its proper divisors (16569158).

28993018 is a wasteful number, since it uses less digits than its factorization.

28993018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 28993018 is about 5384.5165056855. The cubic root of 28993018 is about 307.2070243642.

The spelling of 28993018 in words is "twenty-eight million, nine hundred ninety-three thousand, eighteen".